Correspondence, pedigrees, notes, data, mainly arising from Darlington's published appeals for information on cousin marriage, but some Darlington's own notes.

Correspondence, pedigrees, notes, data, mainly arising from Darlington's published appeals for information on cousin marriage, but some Darlington's own notes.

Correspondence, pedigrees, notes, data, mainly arising from Darlington's published appeals for information on cousin marriage, but some Darlington's own notes.

Correspondence, pedigrees, notes, data, mainly arising from Darlington's published appeals for information on cousin marriage, but some Darlington's own notes.

Correspondence, pedigrees, notes, data, mainly arising from Darlington's published appeals for information on cousin marriage, but some Darlington's own notes.

Correspondence, pedigrees, notes, data - mainly medical data.

Correspondence, pedigrees, notes, data marked 'incomplete', 'not used', etc.

Correspondence, pedigrees, notes, data marked 'incomplete', 'not used', etc.

Correspondence, pedigrees, notes, data, mainly arising from Darlington's published appeals for information on cousin marriage, but some Darlington's own notes.

Correspondence, pedigrees, notes, data, mainly arising from Darlington's published appeals for information on cousin marriage, but some Darlington's own notes.

Correspondence, pedigrees, notes, data, mainly arising from Darlington's published appeals for information on cousin marriage, but some Darlington's own notes.

Correspondence, pedigrees, notes, data, mainly arising from Darlington's published appeals for information on cousin marriage, but some Darlington's own notes.

Correspondence, pedigrees, notes, data, mainly arising from Darlington's published appeals for information on cousin marriage, but some Darlington's own notes.

Correspondence, pedigrees, notes, data, mainly arising from Darlington's published appeals for information on cousin marriage, but some Darlington's own notes.

Correspondence, pedigrees, notes, data related to 'Double Test Marriage', i.e. individuals marrying once to a cousin and once to an unrelated person. Many of the documents have a note 'DTM' and Darlington's list of the subjects is enclosed at MS. Darlington c. 51/E.309.

Correspondence, pedigrees, notes, data related to 'Double Test Marriage', i.e. individuals marrying once to a cousin and once to an unrelated person. Many of the documents have a note 'DTM'. Contains a list of the subjects.

Correspondence, pedigrees, notes, data related to 'Double Test Marriage', i.e. individuals marrying once to a cousin and once to an unrelated person. Many of the documents have a note 'DTM' and Darlington's list of the subjects is enclosed at MS. Darlington c. 51/E.309.

Correspondence, pedigrees, notes, data related to 'Double Test Marriage', i.e. individuals marrying once to a cousin and once to an unrelated person. Many of the documents have a note 'DTM' and Darlington's list of the subjects is enclosed at MS. Darlington c. 51/E.309.