Includes 1p typescript draft letter to the The Observer re meccano and D.R. Hartree. With newspaper cutting and photograph of Hartee with a meccano model of differential analyser.

1982

JeffreysB/J/J208-J269/J232
File
1982

Part of Papers of Bertha Jeffreys

1983

JeffreysB/J/J270-J298/J272
File
1983

Part of Papers of Bertha Jeffreys

1984-1986

JeffreysB/J/J270-J298/J273
File
1984–1986

Part of Papers of Bertha Jeffreys

1985

JeffreysB/J/J208-J269/J237
File
1985

Part of Papers of Bertha Jeffreys

1986

JeffreysB/J/J208-J269/J238
File
1986

Part of Papers of Bertha Jeffreys

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