Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
The Schaefer System (booklet)
'The Schaefer System of Supporting Underground Roads Tunnels Tubes and Shafts'. 24 pages, illustrated throughout. Undated.
Pwnc
Diwydiant
Rhif yr Eitem
2018.51/54
Derbyniad
Old stock, 14/2/2018
Mesuriadau
Meithder
(mm): 243
Lled
(mm): 157
Deunydd
papur
cerdyn
metel
Lleoliad
In store
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