G. Shark Codes
The Library is in the lower left corner of the village, south of Ken's shop and west of Rosie's Restaurant. Mary is in charge of the shop. You dont actually buy anything at the Library. It holds the books that contain pictures of the bugs, fish, events, and plants that you've found. Also the Trade Center is found here.
The easiest book to fill is the Fish book. Fish you can catch year round and you dont have to trade with anyone to get all 18 pages of the book. The second is the Bug book. There are different bugs in the Spring and Summer, so if you've caught all of the Spring bugs you're finished collecting until Summer time. The Plant book is one of the more difficult ones to complete. When you harvest your first plants out of the Hot House, the book automatically has two of the opposite gender's plant pictured in it's pages. That leaves two that it has no information on. You must trade with someone of the opposite gender in order to obtain the seeds needed to fill in the pictures. Even if you have a cat as a pet, it only will gather normal crop seeds, not herb and flower seeds. If Mary comes by on your birthday, she'll give you a gift of a picture that you wouldnt normally obtain.
The last book is the Photo book, which shows various events that you have participated in. There are 7 photo that you can collect.
There are even more pictures in the other books. There are 18 in the fish book, 27 in the bug book, and 8 in the plant book (although there can be more depending if you get gifts from Mary). Each one has been separated into their own sections.