Subject to existing valid claims, the boundaries of the Sequoia National Forest, California, be, and they are, extended to include the following described lands, which shall hereafter be subject to the laws, rules, and regulations relating to said national forest:
Southwest quarter, southwest quarter section
; east half northeast quarter, southwest quarter, northeast quarter, southeast quarter, northwest quarter, east half southeast quarter section
; east half northwest quarter, northwest quarter northwest quarter, northeast quarter section
; northwest quarter northwest quarter section
; and tract numbered 48 in the southeast quarter section
, all in township 21 south, range 31 east, of the Mount Diablo meridian in California.