[Monthly except July and August. This is Bureau of Education number. Text and illustrations on p. 2-4 of cover.]
Notes:
[Monthly except July and August. This is Bureau of Education number. Text and illustrations on p. 2-4 of cover.] * For Sale by Superintendent of Documents. Paper, 5c. single copy. 30c. a yr. (10 months); foreign subscription. 55c.
Availability:
* For Sale by Superintendent of Documents. Paper, 5c. single copy. 30c. a yr. (10 months); foreign subscription. 55c.