La biblioteca está llena de libros.
Observa libros en la biblioteca (él).
We say a library of books.
It doesn't make sense as written. 100 = cien; 'libro' = '(a) book', or 'I deliver'; 'la biblioteca' = 'the library' If 'libro' were 'libros', '100 libros' = '100 books', but no specific connection is suggested with 'la biblioteca' ('the library') If you are trying to say "There are 100 books in the library." the Spanish is "Hay ciento libros en la biblioteca."
"Full" in Spanish is "lleno" if you are talking about a male, or "llena" if you are talking about a female. It is pronounced "YAY-no" or "YAY-nah". Please see this site for confirmation of the translation: http://www.answers.com/library/Translations
bibloitica
You say it "tarjeta de biblioteca."
Lleno de vida is the best way to say "full of life" in Spanish.
El Libro= The book Libros= Books
English: I like books. Spanish: Me gusta leer libros.
Reference books and whatever books that say you are not allowed to check them out.
¿Fue a la biblioteca?
Camina al biblioteca.