Author: Romberg, J., 1892.:
Title: Petrographische Untersuchungen an argentinischen Graniten, mit besonderer Berücksichtigung ihrer Structur und der Entstehung derselben.
Description: N. Jahrb. Miner. Geol. Paläont., Beil.-Bd. III: pp. [ii],275-399,[23], 72 microphotos on 12 plates. Author's offprint, old half cloth. Fine. - With author's presentation inscription to the German geologist Dr. Max Fiebelkorn. - See Johannsen, Petrography, vol. II p. 134: "[...] not only did Romberg find all transisiton sizes from needle-like individuals to determinable rutile, but he also determined their positive optical character in a granite from Argentina."

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