HeinOnline has announced that it will soon be adding Subject Compilations of State Laws as an a-la-carte library module. According to the HeinOnline Weblog

This database contains references to more than 17,000 sources of 50-state surveys published in law review articles, books, court briefs and opinions, federal and state government publications, and loose-leaf services. Researchers will have the ability to search all 25 volumes in one place and link directly to journals found within HeinOnline.

As its name implies, Subject Compilations of State Laws is a great source for finding books and articles containing fifty state surveys of state law on specific subjects. Westlaw and LexisNexis also offer fifty state survey products.