Blackwell Colliery Company Employee Registers, giving date, whether qualified to work alone, signature or mark and name of employee, occupation and signature of witness 1) Surface: Oct 1888-Feb 1950 (see underground for 1950-1960) 2) Underground: Oct 1888-May 1960, including surface employees 1950-1960 [Seemingly for the New Colliery at Alfreton, which opened in 1888] 1888-1960