I have a large amount  (I think about  550-600ish) of romance books that I have become the owner of and so I am trying to sell some of them and a gal has sent me her wish-list, but she doesn't know if they are Harlequins or what.  A couple of the titles I am familiar with, but the others I am not sure. 

Theresa

Gosh that's a lot of work for you! The only thing  I can think of to do is search here and see if it says so in the title when it pulls up (sometiems it has harlequin in parentheses) and when you click to see the description sometimes it says harlequin for the publisher. You can also search the title on amazon or half.com or ebay...I'm working nightshift tonight and tomorrow night and can help you 'hunt' if you want...I read and surf the 'net between samples I have to run and tonight's been slow so far...sometimes the author can tell you since some are 'famous' for writing harlequin/silhouette though some went on to write the larger books.

Try fictiondb.com www.fictiondb.com.

Try Fantasticfiction.com

Thanks to Susanna, I found out what all the titles were that she was looking for.

Theresa