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Could add the San Jacinto fault running through and related major earthquakes. Also add climate and the San Jacinto River. Lvi56 ( talk) 06:49, 17 September 2010 (UTC) reply

A very good resource that might be useful for this article: http://www.tlma.co.riverside.ca.us/genplan/content/ap2/sjvap.html Lvi56 ( talk) 22:35, 18 September 2010 (UTC) reply

I'm not too sure, but conclusions drawn from this map might violate WP:NOR. So I don't think it can be used as a source in the case of Valle Vista being annexed. Lvi56 ( talk) 20:04, 18 September 2010 (UTC) reply