nostr:npub17saz4g3jlzhsxphhjs8w4f68z8fu47khcqpfhrchc8hx5hpcpucsl6emr5 nostr:npub1r34jrms2reyvxvmmfmsyafqxe6mpsqh2mccck8y0ux8uxgq6qcysdmex6f nostr:npub12s2mr55rn83px9ttqwdrqyau7kf89sgcuaz8s36svv23xntf8cjsjmryh6

I like physical books but I love pdf because they can be search easily. They are excellent for reseaching.