ISBN not imported from BibTex records
                    I am converting a homegrown database to Zotero, using BibTex format records.  ISBN field was a total fail on import.  Wondering if I used the wrong tag, or if field contents don't conform to expected format, or if there is another explanation.  Other data ingested fine.  
Here is an example record:
@book{A00228,
title={Grand Canyon National Park: Birds and Mammals.},
author={Elizabeth Briars Hart and Stephen Whitney},
year={2006},
publisher={Seattle, WA: Mountaineers Books},
isbn={1594850208 pa},
keywords={Animals; NORTH AMERICA, WESTERN},
note={96 birds and 35 mammals; color illustrations. Laminated sheet. 1 sheet. $5.95pa.}
}
                 
                            Here is an example record:
@book{A00228,
title={Grand Canyon National Park: Birds and Mammals.},
author={Elizabeth Briars Hart and Stephen Whitney},
year={2006},
publisher={Seattle, WA: Mountaineers Books},
isbn={1594850208 pa},
keywords={Animals; NORTH AMERICA, WESTERN},
note={96 birds and 35 mammals; color illustrations. Laminated sheet. 1 sheet. $5.95pa.}
}
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It's also preferable to have the publisher location as "address" as in
address={Seattle, Wa}