Bestandslücken
[N=1924,31,34,38-42,50; 1928,1-26; 1929,27-52; 1930,27,29-52; 1932,1-26; 1933,34; 1934,26,28-40,42-52; 1935,1-26; 1936,1,4-10,12,14-15,18-20,23-41,43-52; 1938,27-37,39,41-43,45-52; 1965,27; 1966,1-9,36-52; 1967,1-25,27,29-32,34-37,39-40,44,50-52; 1968,1-3,5-25,27-29]