Three books that every school library should have? How can I possibly narrow that down? Let me try:
Big Sarah's Little Boots (Paulette Bourgeois) was my daughter's favourite book. At 2, she repeatedly borrowed this book from our Early Learning Centre and we read it so often she knew it by heart. Her language was very delayed so no one but me could understand the story, but she'd recite it over and over. Shortly after finding this book we moved. While unpacking her room I found this book tucked in with her precious belongings. She'd stolen it from the centre! Needless to say, I bought a copy for her and mailed the well-loved and stolen book back, with a note thanking them for fostering in her a love of reading and language.
Matthew and the Midnight Turkeys (Allen Morgan) - My son loved this book. It's funny, imaginative, and smart. It speaks volumes of little boys, their resistance to sleeping in, and the things they expect will happen when they build a turkey trap. We still own this book and still refer to it often, even though he is now 17.
Lord of the Rings (J. R. R. Tolkien) - My last born didn't read many children books. Hesitant to begin reading, he took off with a shot once he'd mastered it. He first read Lord of the Rings in fourth grade and often insists that everyone, everywhere should read it. Now in 7th grade, he continues to push this collection on anyone who will listen to him. "Just read it!"