...Basal point is to N.W. of Mound. Site staked off in 10 ft squares. Locality example 107-22 means 107th square (1070 ft.) E. of Meridian passing thru basal point and 22nd square (220 ft.) S. of basal line." Published: AAE, Vol. 23, pg. 40. No. Pieces: "1." Piece count based on plural Description.