The Troop maintains a merit badge library at the Winnetka Community House. You can ask at the front desk for a key.
Please be sure to return books when you have finished using them. You can also drop off books that you are finished using.
Merit badge requirements are available online at meritbadge.org. Workbooks (like this one for Astronomy Merit Badge) are available through the site, and are a great tool to help get and stay organized about merit badges.
The supporting merit badge content, however, is generally only available in the merit badge books. The content in the books stays relatively static, but the requirements for the badges change a little bit with each revision. Please be sure that you are using the most current requirements to complete your badge.