Thanks both,
i cant confirm wich of you is right.. i tried to find the
catalog of the 31th may and i didnt found. For the books of
Schulman i dont know what mean list 90, 199. Considering we have to look at books before 1938 or of 1938 because of the date of printing of the
RIC 4B. The Schluman author were only 25 years old in 1938. Therefore i think it is the
catalog but it is a strange note from
RIC that habitually say the date and then number of lot.