Hans Peter Mareus Neilsen Gammel (September 24, 1854 – February 11, 1931) was an author and bookseller. He served as editor and publisher of a series of books reporting Texas legislation enacted by each congressional and legislative session. His first publication consisted of 10 volumes and covered 75 years of Texas legal history. ''The Laws of Texas 1822-1897'' has long been a primary resource for the study of Texas legal history during the Nineteenth Century.
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