Information sheets on the following collieries can be found within this file (please note that the amount of information on each sheet varies):
Nantdyrus
Nantewlaeth (includes an additional information sheet)
Nantgarw (includes an additional handwritten information sheet, section of strata diagrams Nantgarw/Lady Windsor and a report on a project to develop Nantgarw Colliery)
Nantgrenig Slant
Nantgwyn
Nantllesg
Nant Melyn
Nantmelyn
Nant Rhondda
Nantwen and Danyderi
Nantyfedw Level
Nantyffin Drift
Nantyglo
National
Naval (includes an extract from an article)
Navigation (Crumlin) (includes additional information sheets)
Navigation (Moutain Ash)
Navigation (Sirhowy)
Neath Chain Colliery
Nebo Level
Newbridge (Gelliwion)
New Clydach
New Coalbrookvale Level
New Cross Hands
New Cwm Mawr
New Duffryn (Rhymney)
New Dynant
New Forest
New Gellihir
New Lodge
New Mountain Level
New No. 2 Level
New Pool
New Rockwood
New Slope (Ebbw Vale)
New Slope (Viponds)
New Tredegar
New Wernddu
New Yniscu Level
Newlands Slant
Nine Mile Point (includes a copy of an application to close report)
Nixon's Navigation (includes an extract from an article and copies of drawings of The Nixon Ventilator)
No. 1/No. 2 etc
Normandy
North Pit
North and South Pits
North Blaina
North Celynen
North End
North Rhondda (includes an additional information sheet)
Number Nine Pit (Bute)