I have made available PDF files of all issues of Takei Morishige’s journal 「マンドリンとギター研究資料」 (Mandolin and Guitar Research Articles) which was published from January, 1942 to November, 1943. Each issue was only 4 pages and printed on a single, folded piece of newsprint. The journal ended publication due to a paper shortage during the war. Takei’s publishing activities started in 1916 with his journal titled 「マンドリンとギター」”Mandolin and Guitar”.
UPDATE May 2011: A table of contents list in both Japanese and English is now available.
UPDATE October 2019: Table of contents improved, PDF sizes reduced, OCR processed on PDF files.