- Hubbard, H. G. 1897b. The ambrosia beetles of the United States [Pages 9-30]. in: Some miscellaneous results of the Division of Entomology.. United States Department of Agriculture, Bureau of Entomology, new series.. 1-87 pp..
- Hubbard, H. G., and E. A. Schwarz. 1878a. List of Coleoptera found in the Lake Superior region (Part 2 of The Coleoptera of Michigan [Scolytidae, p 664-666]. American Philosophical Society, Proceedings 17627-667.
- Hubbard, H. G. 1896. The brood cell of Xyleborus xylographus. Entomological Society of Washington, Washington, D. C., Proceedings 3318.
- Hubbard, H. G. 1897a. Ambrosia beetles. United States Department of Agriculture, Yearbook 1896421-430.
- Hubbard, H. G. 1885. Insects affecting the orange. The cylindrical bark-borer, (Hypothenemus eruditus Westw.). United States Department of Agriculture, Division of Entomology 1885: 173-174, pl. 14, 1 fig.
- Hubbard, H. G. 1895. Communication. Entomological Society of Washington, Washington, D.C., Proceedings 3:291-292.
- Hubbard, H. G., and E. A. Schwarz. 1878b. The Coleoptera of Michigan [Scolytidae, p 622-626] . American Philosophical Society, Proceedings 17:593-669.