The Southwestern Historical Quarterly, Volume 16, July 1912 - April, 1913 Page: 228
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228 The Southwestern Historical Quarterly
ern boundary by a line running south of west from the mouth of
the Gila river to the vicinity of latitude thirty degrees and thirty
minutes on the Pacific coast. The eastern boundary begins at the
mouth of the Gila river and runs northeast, joining the 42d parallel
at the 108th meridian. The Dufour map, of the same year,
indicates no, boundary between Upper and Lower California. The
eastern boundary, beginning near the 33d parallel, runs northward
between 112 and 113 degrees of longitude west from Greenwich,
to the vicinity of the 36th parallel of latitude, then turns west of
north and joins the 42d degree of north latitude on longitude 116
west. The northern boundary of Upper California, according to
Rosa's map, extends from longitude 108, west from Greenwich,
westward along the 42d parallel to the Pacific, while on Dufour's,
the same boundary includes only the territory along the 42d parallel
between 116 degrees west longitude and the Pacific ocean.
Tanner's Map of the United States of Mexico, published in
1846, and Mitchell's Map of Mexico including Yucatan and Upper
California, published in the same year, give California similar
eastern boundaries but boundaries which differ considerably from
the maps published in 1837. The eastern line runs rather irregu-
larly between 30 degrees and 31 degrees 30 minutes of longitude
west from Washington from about the 32d to the 42d parallels of
latitude. Another map drawn by Charles Preuss from the surveys
of John C. Fremont and other authorities (Washington, 1848)-the
one which seems to have been used more frequently than any other
by the California Convention of 1849,-indicates still different
boundaries.' The southern line, beginning on the Pacific coast,
about one marine league south of San Diego2, runs almost directly
east and west to the Gila river, and along that stream to the vi-
cinity of the present Tempe, Arizona, near the 112th degree of
longitude west from Greenwich. The eastern line extends northward
through Utah, just west of Bear Lake, to the 42d parallel north
latitude. The map used by the United States and Mexico in es-
tablishing the boundaries in 1848 was Disturnell's Mapa de los
Estados Unidos de Mejico (California, New York, 1817). The
edition of this map used by the writer, which seems to have indi-
cated the same boundaries for California as the one just cited, was
'For this map see California Message and Correspondence (1850).
2Conmpilation of Treaties in Force (Washington, 1904).
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Texas State Historical Association. The Southwestern Historical Quarterly, Volume 16, July 1912 - April, 1913, periodical, 1913; Austin, Texas. (texashistory.unt.edu/ark:/67531/metapth101058/m1/236/: accessed July 21, 2017), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting Texas State Historical Association.