http://es.wikipedia.org/wiki/James_Terry_Gardiner

Tooley's Dictionary of Mapmakers, 2001---T. II, pág. (Gardner [Gardiner], James Terry (1842-1912). Surveyor and engineer)

Triangulation Map of Colorado, 1877---(by J. T. Gardner and A. Wilson ; F.V. Hayden . U.S. Geologist in Charge)