Published in Transactions of the San Diego Society of Natural History, in 1945, in volume 10, pages 133-216
The transverse volcanic biotic province of central Mexico and its relationship to adjacent provinces
Published in Transactions of the San Diego Society of Natural History, in 1945, in volume 10, pages 217-236
Published in Transactions of the San Diego Society of Natural History, in 1945, in volume 10, pages 269-306