Abbreviation: Probat.J.
Abbrev Key: PROBATJ

Abbreviation: Probl.Pravoved.
Abbrev Key: PROBLPRAVOVED

Abbreviation: Probl.Rad.Nar.
Abbrev Key: PROBLRADNAR

Abbreviation: Probs.Econ.
Abbrev Key: PROBSECON

Abbreviation: Probs.Pol.et Soc.
Abbrev Key: PROBSPOLETSOC

Abbreviation: PrObTrE
Abbrev Key: PROBTRE

Abbreviation: Proc.& Judg.
Abbrev Key: PROCJUDG

Abbreviation: Proc.APS
Abbrev Key: PROCAPS

Abbreviation: Proc.Colloq.on the L.of Outer Space
Abbrev Key: PROCCOLLOQONTHELOFOUTERSPACE

Abbreviation: Proc.Conc.Act
Abbrev Key: PROCCONCACT