This catalog gives the titles of all the photographs which have been donated to the Society up to the end of May, 1902. It is arranged alphabetically by states and countries. The numbers are from 1 to 1418. There is also a subject index with headings of some of the principal geologic phenomena under which the numbers and brief titles of the photographs are given in numerical order.

The original number of photographs was 2,037, as given in catalogs of accessions published in the Proceedings from volumes 1 to 12. It was known for some time that the collection had become too bulky and contained a large amount of worthless material. On my suggestion a committee was appointed, consisting of G. K. Gilbert, J. S. Diller, and myself, with authority to exclude the undesirable views. This was done in 1901, photographs being rejected only when there was unanimous agreement. . . .

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