today is the book Managing Abandoned Mines for Bats by Sherwin, Altenbach and Waldien. It's a comprehensive and technical treatment about using abandoned mines for the conservation and protection of bats. The 103 page document is entirely color illustrated - both images and figures - and includes considerable scientific data.
Here's the on-line downloadable version (7.48 Mb .pdf file.) Remember, bats need friends!
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