1979 Niagara Falls, New York: representatives Math Eitemau Uwchlwytho gan The Welsh North American Association (WNAA)
1979 Niagara Falls, New York: travel Math Eitemau Uwchlwytho gan The Welsh North American Association (WNAA)
1979 Niagara Falls, New York: travel Math Eitemau Uwchlwytho gan The Welsh North American Association (WNAA)
1978 Mineapolis: Local Society representation Math Eitemau Uwchlwytho gan The Welsh North American Association (WNAA)
1978 Mineapolis: Concert programs Math Eitemau Uwchlwytho gan The Welsh North American Association (WNAA)
WNGG, Bellevue 1994, opening night concert Math Eitemau Uwchlwytho gan The Welsh North American Association (WNAA)
San Jose 2001: registration comparisons Math Eitemau Uwchlwytho gan The Welsh North American Association (WNAA)
San Jose: registration issues Math Eitemau Uwchlwytho gan The Welsh North American Association (WNAA)
San Jose 2001: Preregistration Math Eitemau Uwchlwytho gan The Welsh North American Association (WNAA)
San Jose 2001: Hotel Shipments Math Eitemau Uwchlwytho gan The Welsh North American Association (WNAA)
San Jose 2001: Presenter agreement Math Eitemau Uwchlwytho gan The Welsh North American Association (WNAA)
