Another librarian vote for Elmers! It's not quite archivally perfect, but it will last a long time. If you glue between pages (from a broken spine), place folded wax paper (fold in) in the center of the glued pages, so they don't glue together. Rubber band the book tightly so that the rubber bands look like a tic-tac-toe board, using 4 bands. Then leave it for at least two days.
Works like a charm!
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