Six references on Southwest jewelry and their hallmarks. 1.) FRANK, LARRY. Indian silver Jewelry of the Southwest, 1868-1930. West Chester: Schiffer Publishing Ltd., 1990. 2.) HOUGART, BILLE. Native American and Southwestern Silver Hallmarks, Silversmiths, Designers, Guilds and Traders. Washington, D.C.: TBR International, Inc., 2014. 3.-4.) SLANEY, DEBORAH C. 3.) Blue Gem, White Metal, Carvings and Jewelry from the C.G. Wallace Collection. Booklet. Phoenix: Heard Museum, 1998. 4.) The Role of C. G. Wallace in the Development of 20th Century Zuni Silver and Lapidary Arts. A thesis submitted to the Graduate Faculty at the University of Oklahoma, Graduate College, Norman, 1992. Typescript copy. 5.) WRIGHT, B ARTON. Hallmarks of the Southwest. West Chester: Schiffer Publishing, Ltd., 1989. Signed/inscribed by the author. 6.) WRIGHT, MARGARET NICKELSON. Hopi Silver, The history and hallmarks of Hopi silversmithing. Revised edition. Flagstaff: Northland Press, 1982. Condition: Fair-Very Good; the volumes are from a well-used research library; some light toning; some with owner's signature.