In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Blaina like this:
BLAINA, a village, with iron-works, in Ebbw-Vale, Monmouth; on the Western Valleys railway, 2 miles SSE of Nantyglo. It has a station on the railway, and a post office‡ under Tredegar. A church, in the Norman style, was built here in 1845. The circumjacent tract of country is highly picturesque.
A Vision of Britain through Time includes a large library of local statistics for administrative units. For the best overall sense of how the area containing Blaina has changed, please see our redistricted information for the modern district of Blaenau Gwent. More detailed statistical data are available under Units and statistics, which includes both administrative units covering Blaina and units named after it.
GB Historical GIS / University of Portsmouth, History of Blaina, in Blaenau Gwent and Monmouthshire | Map and description, A Vision of Britain through Time.
Date accessed: 19th February 2017
Click here for more detailed advice on finding places within A Vision of Britain through Time, and maybe some references to other places called "Blaina".