Please note that early editions are often known in several different formats (incl. reproductions and even "retyped" versions). Depending on availability different versions have sometimes been used for the cover image shown here and the PDF available through download.
Note on Volume 4 (1955): Korean Philately was probably not published in 1955 after number 5. See the "Message from the President" on the frontpage of Vol. 5 No. 1 (April 1956) for a possible explanation.
Also, the issues from Vol. 4 shown here are from the same pages (notice the page numbering). It seems someone later on typed these pages in order to save whatever was left of Vol. 5 after Harold Bearce fell away. See Korean Philately Vol IV No. 1-5 (Q4 1954/Q1 1955) for all pages known to date.