The Journal of San Diego History
SAN DIEGO HISTORICAL SOCIETY QUARTERLY
Fall 1975, Volume 21, Number 4
James E. Moss, Editor
Thomas L. Scharf, Assistant Editor
By Ronald L. Ives
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Fig. 1. Summary map of central North America, showing length of Serra march compared to more familiar distances.
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Fig. 2. Climatic maps of western North America, showing classification of Baja California climate by three of the better-knoewn systems. BWh, BWk, Eb’d all indicate “desert.”
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Fig. 3. Climatic charts for selected stations from Los Angeles southward.
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Fig. 4. Rainfall profiles, seasonal distribution, and terrain profiles for Baja California.
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Fig. 5. Aridity of the Sonoran Desert Region, as computed by DeMartonne’s Formula. A small value of the aridity index indicates great aridity.
Page 27. Fig. 6.
Generalized east-west cross section of Baja California, summarizing major geologic, tectonic, and erosional components.
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Fig. 7. Cross section showing characteristics of man and mule trails.
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Fig. 8. Areneno foot trail at Pinacate, Sonora. So far as can be determined, this trail has never been travelled by a shod animal.
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Fig. 9. Characteristics of mule trails.
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Fig. 10. General route of the Serra trail from Loreto to Santa Gertrudis.
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Fig 11. Ancient trails northward from Santa Gertrudis to San Juan de Dios.
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Fig. 12. Serra route from San Juan de Dios to San Diego.