See series timeline (depends on key dates being set correctly)
| Key Date | Pub. Date | Volume | Number | Indicia Publisher | Brand | Pages | Price | Frequency |
|---|---|---|---|---|---|---|---|---|
| 1970-09-00 | September-October 1970 | S-13 | National Periodical Publications, Inc. | DC | 68 | 0.25 USD | Published eight times per year | |
| 1970-09-14 | September-October 1970 | ? | S-14 | ? | DC | 68 | 0.25 USD | ? |
| 1970-09-15 | September-October 1970 | ? | S-15 | ? | DC | 68 | 0.25 USD | ? |
| 1970-09-16 | September-October 1970 | ? | S-16 | ? | DC | 68 | 0.25 USD | ? |
| 1970-09-17 | September-October 1970 | 2 | S-17 | ? | DC | 68 | 0.25 USD | ? |
| 1970-10-18 | October-November 1970 | ? | S-18 | ? | DC | 68 | 0.25 USD | ? |
| 1970-10-19 | October-November 1970 | ? | S-19 | ? | DC | 68 | 0.25 USD | ? |
| 1970-10-20 | October-November 1970 | S-20 | National Periodical Publications, Inc. | DC | 68 | 0.25 USD | eight times a year | |
| 1971-01-00 | January-February 1971 | S-21 | National Periodical Publications, Inc. | DC | 68 | 0.25 USD | eight times a year | |
| 1971-03-22 | February-March 1971 | ? | S-22 | ? | DC | 68 | 0.25 USD | ? |
| 1971-03-23 | March-April 1971 | ? | S-23 | ? | DC | 68 | 0.25 USD | ? |
| 1971-05-24 | May-June 1971 | ? | S-24 | ? | DC | 68 | 0.25 USD | ? |
| 1971-07-25 | July-August 1971 | ? | S-25 | ? | DC | 68 | 0.25 USD | ? |
| 1971-07-26 | July-August 1971 | ? | S-26 | ? | DC | 68 | 0.25 USD | ? |
| 1976-07-00 | Summer 1976 | 3 | 27 | National Periodical Publications, Inc. | DC | 52 | 0.50 USD | quarterly |