Useful references are . . .
Albert A. Nofi. The Spanish - American War, 1898, 1996. This very accessible work is a source of extensive information from personalities to units. Analysis is not its objective but there is some which helps.
Donald M Goldstein and Katherine V. Dillon, The Spanish - American War - The Story and Photographs, 1998. A very good resource. The graphics are most intriguing.
Stan Cohen, Images of the Spanish - American War April - August 1898, 1997. This is a rich and expansive resource.
Two special references required noting . . .
Russell E. Miller, The Larger Hope, 2 vol., 1979, 1985. A remarkable history and resource for the unorthodox and mostly unnoticed liberal faith.
Marc McCutcheon, Everyday Life in the 1800's, 1993. An indispensable help for writers, students and historians.