¹ Excluded from this discussion are the large newspaper clipping files maintained by the major Japanese newspapers for aid in their editorial work, as these will normally not be available to the American researcher. The file of the Asabi Sbimbun's Research Section (Chosa-bu) is probably the most representative of the kind.

² In view of the difficulty of obtaining illegally printed prewar Japanese Communist materials, mention should also be made of the reprints in four volumes (averaging 250 pages) of Sekki (Red Flag), the illegal organ of the Japanese Communist Party. Published officially now by the Party, these cover the period 1928 to 1935 including more than thirty extras and contain an eight-page chronology of the Japanese Communist movement for the same period. (Close to forty issues including all of 1928 are missing, supposedly because these were unobtainable. It is not unlikely that another contributing factor was a desire to eliminate material incompatible with the current policy of the Party. A study of this question is in progress.)