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At least some of the literature is free:D:D. Try http://fossilinsects.net/lib.htm Good luck with your amber search thoughperhaps you should consider spending the cash on equipment and polish or otherwise prepare "rough amber". We get quite a lot of jewel amber for ids. of inclusions.This is often very expensive but can't be fully id'd without laboratory equipment and technicians we don't have. I suppose some unprovenanced (no locality) material might be
scientifically useful but rarely. Robert