A very good source for sample interrogatories is volumes 1 through 10 of Bender's Forms of Discovery: Interrogatories, which is available in print and on Lexis (2NDARY;BFDISC). There are special volumes for Automobiles-Collisions (2NDARY;BFDAUT), medical malpractice (2NDARY;BFDMED) and products liability (2NDARY;BFDPRD). Volumes 11 through 16 comprise a legal treatise on interrogatories.
Another good source for interrogatories is the Pattern Discovery series. These books are available in print and on Westlaw. The database identifiers are:
- PDPREML - Pattern Discovery: Premises Liability
- PDMV - Pattern Discovery: Motor Vehicles
- PDTORT - Pattern Discovery: Tort Actions
- PDPRODL - Pattern Discovery: Products Liability
- PDED - Pattern Discovery: Employment Discrimination
One last useful book is Model Interrogatories (James Publishing) by Kevin R. Culhane. To my knowledge this one is not available online but, for a law book, it is not expensive to buy.
Court Filings: Westlaw has databases with interrogatories gathered from court filings: INTERROG-FED for Federal filings; INTERROG-STATE for state filings; and INTERROG-ALL to search Federal and state filings at the same time. If you work in a law firm, you might want to search your Document Management System first to see if you can find free in-house examples.