The lower regions of the ionosphere

[1] APPLETON, 1930, P ROY SOC A, V126, P542

[2] MITRA, 1936, NATURE, V137, P867

[3] MITRA, 1935, NATURE, V135, P953

[4] STEVENS, 1936, NATURE, V137, P896

[5] STEVENS, 1936, NAT GEOG MAG, V59, P693

[6] SYAM, 1936, IND J PHYS 1, V10, P13

[7] WATSON, 1936, NATURE, V137, P866

[8] 1936, NATURE, V137, P782

[1] APPLETON, 1930, P ROY SOC A, V126, P542

[2] MITRA, 1936, NATURE, V137, P867

[3] MITRA, 1935, NATURE, V135, P953

[4] STEVENS, 1936, NATURE, V137, P896

[5] STEVENS, 1936, NAT GEOG MAG, V59, P693

[6] SYAM, 1936, IND J PHYS 1, V10, P13

[7] WATSON, 1936, NATURE, V137, P866

[8] 1936, NATURE, V137, P782