I1S1O1G2R1A1M3S1
11 points
ISOGRAMS is validvalid
ISOGRAM, a line on a map connecting points of equal value [n]
ISOGRAM, a map line indicating points of equal value, also ISOLINE [n]
ISOGRAM, a line on a map connecting points of equal value [n]
ISOGRAM, a map line indicating points of equal value, also ISOLINE [n]