P. S. Ermakov has written:
'Nastanet chas'
N. P. Ermakov has written: 'Research on the nature of mineral-forming solutions' -- subject(s): Mineralogical chemistry
Petr Ivanovich Ermakov has written: 'Nauka i proizvodstvo' -- subject(s): Agricultural innovations, Agriculture 'Sotsial'no-ekonomicheskie problemy sela i pribyl''
S P. Russell has written: 'Fruit'
P. S. Welch has written: 'Limnology'
P. S. Jha has written: 'India'
S. P. Nikitin has written: 'Kon\\'
P. S. Bright has written: 'India'
S. P. P Mminele has written: 'Ngwana wa Mobu'
P. S. Adams has written: 'Aircraft hardening'
S. P. Muradyan has written: 'Grakan hangrvanner'
S. P. Robins has written: 'Object lessons'
S. P. Saburov has written: 'Vsegda soldat'