Obsolete Finnish units of measurement 1970-01-01
Oka (mass) 1970-01-01
Old Cornish units of measurement 1970-01-01
Omer (unit) 1970-01-01
On Weights and Measures 1970-01-01
Ottoman units of measurement 1970-01-01
Oxgang 1970-01-01
Palm (unit) 1970-01-01
Pao (unit) 1970-01-01
Parasang 1970-01-01
Pari (unit) 1970-01-01
Passeree 1970-01-01
Pau (unit) 1970-01-01
Peck 1970-01-01
Penny (unit) 1970-01-01
Pennyweight 1970-01-01
Persian units of measurement 1970-01-01
Polish units of measurement 1970-01-01
Poncelet 1970-01-01
Pood 1970-01-01