Acts and Ordinances of the Interregnum, 1642-1660. Collected and Ed. by C.H. Firth and R.S. Rait for the Statute Law Committee ...C H Firth1911
Oliver Cromwell and the Rule of the Puritans in EnglandFirth, C. H. Firth or Charles Harding1953EPUB381 KB
The Seconde Parte of a Register; Being a Calendar of Manuscripts Under That Title Intended for Publication by the Puritans About 1593, and Now in Dr William's Library, LondonAlbert Peel1915EN
Cromwell's Army (Barnes & Noble Digital Library) A History of the English Soldier During the Civil Wars, the Commonwealth and the ProtectorateCharles Harding Firth2011EPUB707 KBEN
A Letter to the Regius Professor of Modern History on the Teaching and Study of History at OxfordC. H Firth1980EN