"Programming Windows 95", Charles Petzold, Microsoft Press. 1100 pp. Comes with disk. (An expensive book when new)
"Microsoft Windows 3.1 Programmer's Reference, Volume 2 - Functions", Microsoft Press, 1001 pp.
"Microsoft Windows 3.1 Programmer's Reference, Volume 4 - Resources", Microsoft Press, 340 pp.

PM with offers. Will send out Media Mail.