What were the sources of Jewish immigration to Israel between 1939-1951?
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Accepted answer
Generally, it used to divide the immigration to Israel into "waves"(free translation from Hebrew).
during this year, 1939 to 1951, it used to include three waves:
Aliya Bet(free translation: Immigration 2nd) during WW2
Included ~17,000 immigrants, most of them Europeans.
Aliya Bet after WW2
Included ~85,000 immigrants, most of them Europeans
The mass "Aliya" since Israeli independence(May '48) to 1951
Included ~650,000 immigrants from many countries; as Iraq(20%),Romania(19%), Poland(17%), Yemen(8%), Morocco(7%), Bulgaria(6%), Turkey(%), Libya(5%) and Iran, Czechoslovakia, Hungary, Germany, Egypt, USSR, Yugoslavia(all of them 3% or less). Reference for these data can be found here(In Hebrew)