| Issue | #23 |
| Published | July-August 1955 |
| Cover Price | 0.10 USD |
| Pages | 36 |
| Editing | ? |
| Notes | Indicia says "Published bi-monthly". Credits from the GCD mailing list. |
| Characters | Lassie; Timbu |
| Genre | Animal |
| Pencils | Mo Gollub (painting) |
| Inks | Mo Gollub (painting) |
| Colors | Mo Gollub (painting) |
| Notes | Indicia says "Published bi-monthly". Credits from the GCD mailing list. |
| Pencils | ? (photograph) |
| Inks | ? (photograph) |
| Letters | Typeset |
| Notes | "Distinguished achievement award presented to Mr. George T. Delacorte, Jr. ..." |
| Characters | Lassie; Gerry; Rocky; Senhor Vega; Dr. Ricardo; Paraces |
| Synopsis | Lassie and her friends fly to Lima to see Senhor Vega of the Peruvian National Museum. Vega's assistant Dr. Ricardo has plans to take over the museum with the aid of false treasure provided by senhor Paraces. |
| Genre | Animal |
| Pencils | Ralph Mayo |
| Inks | Ralph Mayo |
| Letters | Typeset |
| Notes | Credits for this issue from David A. Roach via Steve Whitaker. |
| Characters | Lassie; Gerry; Rocky; Senhor Madeira; Pedro Madeira |
| Synopsis | Lassie and her friends fly to Argentina to visit the Madeira ranch. Inspired by the riders' rhea hunt, young Pedro takes Lassie on a hunting trip. |
| Genre | Animal |
| Pencils | Ralph Mayo |
| Inks | Ralph Mayo |
| Letters | Typeset |
| Characters | Lassie; Gerry; Rocky; Senhor Serra; Ruiz; Guro |
| Synopsis | On their way home from Argentina Lassie and her friends land in Asunción. They meet senhor Serra whose hardwood lumber camp upriver is due for inspection. The manager and his assistant have been selling off lumber for their own profit. |
| Genre | Animal |
| Pencils | Ralph Mayo |
| Inks | Ralph Mayo |
| Letters | Typeset |
| Notes | Story ends on back cover. Inside back cover in black and white. |
| Letters | typeset |
| Notes | Last panel of back cover. |