the Palestinian sources I refer to come from

Hagopian, Edward and A.B. Zahlen, "Palestine's Arab Population," Journal of Palestine Studies, Vol. III, Walid Khalidi et al., eds., 1974, pp. 32-73.

and

Khalidi, Walid et al., eds., All that Remains: The Palestinian Villages Occupied and Depopulated by Israel in 1948, 1992, Appendix III, p. 582.

In mid 1946 the figure is given as 714,150 - 744,150
cited source -

Said, Edward et al., A Profile of the Palestinian People, Third Ed, 1990, p. 6; Abu-Lughod, Janet, "The Demographic Transformation of Palestine," in Ibrahim Abu-Lughod, ed., The Transformation of Palestine, 1971, pp. 139-63.

Could I once more request the source of your 'facts