Characteristics for an American amphibious assault ship (LPH) in March 1961

Dimensions 592 x 105 x 20 feet. Speed 20 knots. Troop capacity 1,400. Aircraft 20 H-37 or 40 H-4 helicopters.

Source

Army forces in amphibious operations (the Army Landing Force). Department of the Army Field Manual FM 31-12. March 1961.