from Superboy (DC, 1949 series) #203 (August 1974)
from Superboy (DC, 1949 series) #203 (August 1974)
from Superboy (DC, 1949 series) #203 (August 1974)
from Strange Adventures (DC, 1950 series) #14 (November 1951)Eductaional feature about mathematics.
from House of Secrets (DC, 1956 series) #64 (January-February 1964)
from Detective Comics (DC, 1937 series) #194 (April 1953)
from Superboy (DC, 1949 series) #201 (March-April 1974)