cleaning and storage
Sometimes you will find an album of cards (like the ones above) that have been put into old adhesive photo albums (common in 1960's-1980's). The best way to remove these is to let the glue deteriorate by drying out. Remove all of the plastic pages then hang the album over dry warm air (ducted heating is great). Put squashed paper balls inbetween pages to keep them all open like a fan. Over time the dry air (not wet heat) will dry the glue to the point that the cards can be easily removed. Test by lightly bending the pages and the cards should lift. Do not attempt to use your fingernails to lift them, you'll just damage the cards.
Sometimes cards have been glued into paper albums. Hopefully these will be a paste-type glue and not resin or epoxy based glue. Cut out the cards from the album and gently peel as much paper off as you can. For plastic-coated cards you can get a damp cloth and place it to the back of the card. When the paper absorbs the water it will loosen the glue and you can peel the paper away. If this doesn't work then the glue is probably resin or expoxy based and you can't remove those safely.