The U.S. Johnson Map Project (JMP) is a not-for-profit organization whose mission is to preserve the works of American publisher Alvin J. Johnson, including his atlases and books.
[1] The JMP offers the data collected by the project free to public on its website, JohnsonMapProject.org.
[3] The JMP has collected data on these 658 variations, which it presents on its website free of charge.
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