30-arcsec gridded data
8-bit binary values for some, 
(e.g. sand, clay, silt)	- integer percent
texture class - 8 bit unsigned
16-bit unsigned integer for bulk den*100
depth is 8bit unsigned (max is 152)

2984 rows of 6936 values 11 layers

array = 6936 x 2984 x 11 (except depth has one layer)

NAD27

lon
-449100 (124 d 45') to -241020 (66 d 57') delta = 30
(div by 3600 to get lon)

lat
88320 (24 d 32') to 177840 (49 d 24 ') delta = 30

center of upper left cell = -449085 177825  (northwest)