Bergerocactus
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- 2Nd Edition) California Native Plant Society April 1980 COUNTY and ISLAND CODES
- The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family
- A Flora of San Clemente Island, California Peter H
- The Succulent Scrub of San Martín Island, Baja California, Mexico
- Checklist of the Vascular Plants of San Diego County 5Th Edition by Jon P
- Acta Botanica Brasilica - 34(1): 135-148
- Extensive Gene Tree Discordance and Hemiplasy Shaped the Genomes of North American Columnar Cacti
- Volume 6, Number 4 October-November-December 1992
- 1976 Business Gift
- The Cactician a Miscellany of Topics
- Phylogenetic Relationships in Echinocereus (Cactaceae, Cactoideae)
- Bromeliads in the Wild Page 1
- Echinocereus, Special Issue