For those interested in things lupine (the furry, not the floral):
The Wolves of Mount McKinley, by Adolph Murie (United States Government Printing Office, 1944, reprinted 1971). In the words of Dr. David Mech, Murie was "the first biologist to conduct an intensive and objective ecological study of the wolf." Read it to understand how far wolves and our attitudes toward them have come, since the days when Murie noted that "many persons wish to retain the wolf somewhere in the North American fauna, perhaps in the more remote parts of the continent, in wilderness areas where there will not be interference from economic interests."
Three sources from Dr. Mech:
The Wolf: The Ecology and Behavior of an Endangered Species , by L. David Mech (Natural History Press, 1970). IMO,
the seminal book that started a revolution in scientific and popular attitudes and changed the political environment for wolves. (And the serendipity of providing insights into dog behavior.)
Wolves: Behavior, Ecology, and Conservation, edited by L. David Mech and Luigi Boitani (Univ. of Chicago Press, 2003). Comprehensive worldwide survey of current wolf research.
Dr. David Mech Publication List (USGS Northern Prairie Wildlife Research Center). List of mostly scientific publications, many available by online links. The recent materials on taxonomy and on potential conflicts with human interests are worth the wandering among the URL forest.
Of Wolves and Men, Barry Holstun Lopez (Charles Scribner's Sons, 1978). Still the best examination of the origins and evolution of human attitudes toward wolves.