R. Smith Bassler, ?Bibliographic index of  American Ordovician  and Silurian fossils?, Smithsonian Institution, United States National Museum. Bulletin, vol. 92, Volume 2, pp. [i-ii]-iv+719-1521+4 pls., 1915.

R. Smith Bassler, ?Bibliographic index of  American Ordovician  and Silurian fossils?, Smithsonian Institution, United States National Museum. Bulletin, vol. 92, Volume 1, pp. [i-vi]-viii+1-718, 1915.