I love 50-state surveys of laws for easy charts outlining basic similarities and differences in state laws. These are great resources for finding primary law citations in a quick glance. We have several sources in our library for finding these kinds of topical surveys. The National Survey of State Laws is a great source for this with a wide range of topics available.
The 2019 edition was recently released in print and online, and library users can use this resource on HeinOnline right away. Prior editions back to 2005 are also available on HeinOnline.
New chapters include: