I was on the road a few months ago, and had promised Bahr that once I got home, I would produce the passages from Strabo where he had discussed Eratosthenes. So I thought I would finally do that.
From the notes I made while reading Strabo back in 2003, it appears that Strabo discussed the spherical earth, based on what he learned from Eratosthenes, in the following places in Book 1 of his Geography:
1.1.20: http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Strabo/1A*.html20 Most of all, it seems to me, we need, as I have said, geometry and astronomy for a subject like geography; and the need of them is real indeed; for without such methods as they offer it is not possible accurately to determine our geometrical figures, "climata," dimensions, and the other cognate things; but just as these sciences prove for us in other treatises all that has to do with the measurement of the earth as a whole and as I must in this treatise take for granted that the universe is sphere-shaped, and also that the earth's surface is sphere-shaped, and, what is more, I must take for granted the law that is prior to these two principles, namely that the bodies tend toward the centre; and I need only indicate, in a brief and summary way, whether a proposition comes — if it really does — within the range of sense-perception or of intuitive knowledge. Take, for example, the proposition that the earth is sphere-shaped: whereas the suggestion of this proposition comes to us mediately from the law that bodies tend toward the centre and that each body inclines toward its own centre of gravity, the suggestion comes immediately from the phenomena observed at sea and in the heavens; for our sense-perception and also our intuition can bear testimony in the latter case. For instance, it is obviously the curvature of the sea that prevents sailors from seeing distant lights at an elevation equal to that of the eye; however, if they are at a higher elevation than that of the eye, they become visible, even though they be at a greater distance from the eyes; and similarly if the eyes themselves are elevated, they see what was before invisible. This fact is noted by Homer, also, for such is the meaning of the words: "With a quick glance ahead, being upborne on a great wave, [he saw the land very near]." So, also, when sailors are approaching land, the different parts of the shore become revealed progressively, more and more, and what at first appeared to be low-lying land grows gradually higher and higher. Again, the revolution of the heavenly bodies is evident on many grounds, but it is particularly evident from the phenomena of the sun-dial; and from these phenomena our intuitive judgment itself suggests that no such revolution could take place if the earth were rooted to an infinite depth. As regards the "climata," they are treated in our discussion of the Inhabited Districts.
1.3.3: http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Strabo/1C*.html3 Now after Eratosthenes has himself told what great advances in the knowledge of the inhabited world had been made not only by those who came after Alexander but by those of Alexander's own times, he passes to his discussion of the shape of the world, not indeed of the inhabited world — which would have been more appropriate to his discussion of that subject — but of the earth as a whole; of course, one must discuss that point too, but not out of its proper place. And so, after he has stated that the earth as a whole is spheroidal — not spheroidal indeed as though turned by a sphere-lathe, but that it has certain irregularities of surface — he proceeds to enumerate the large number of its successive changes in shape — changes which take place as the result of the action of water, fire, earthquakes, volcanic eruptions, and other similar agencies; and here too he does not preserve the proper order. For the spheroidal shape that characterises the earth as a whole results from the constitution of the universe, but such changes as Eratosthenes mentions do not in any particular alter the earth as a whole (changes so insignificant are lost in great bodies), though they do produce conditions in the inhabited world that are different at one time from what they are at another, and the immediate causes which produce them are different at different times.
If one followed my arguments in the "Round Earth Rountable" about the irregularities of the land surface, one may see that they were long ago precipitated by Strabo. That I would be expect to be the case. But the realization defeats perhaps half of Dubay's supposed "200 Proofs".
Further references are made at 1.3.22
1.4.1: http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Strabo/1D*.html1 In his Second Book Eratosthenes undertakes a revision of the principles of geography; and he declares his own assumptions, to which, in turn, if there is any further revision to be made, I must undertake to supply it. Now his introduction of the principles of mathematics and physics into the subject is a commendable thing; also his remark that if the earth is sphere-shaped, just as the universe is, it is inhabited all the way round; and his other remarks of this nature. But as to the question whether the earth is as large as he has said, later writers do not agree with him; neither do they approve his measurement of the earth. Still, when Hipparchus plots the celestial phenomena for the several inhabited places, he uses, in addition, those intervals measured by Eratosthenes on the meridian through Meroë and Alexandria and the Borysthenes, after saying that they deviate but slightly from the truth. And, too, in Eratosthenes' subsequent discussion about the shape of the earth, when he demonstrates at greater length that not only the earth with its liquid constituent is sphere-shaped but the heavens also, he would seem to be talking about things that are foreign to his subject; for a brief statement is sufficient.
(Strabo described the οἰκουμένη further on in that chapter, especially in 1.4.5 and 1.4.6 where he also showed that he could be critical of Eratosthenes.)
Further references are made at 2.3.3, where we also see some errant proto-Dubay logic:
http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Strabo/2C*.htmlThen there are further references at 2.5.1 through 2.5.5, and at 2.5.10 (where he further discusses the οἰκουμένη):
http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Strabo/2E1*.html