Okhrana ended in 1917.
Yurii Aleksandrovich Shtyurmer has written: 'Okhrana prirody i turizm'
A. F. Tret'yakov has written: 'Okhrana narodnogo zdorov'ya v RSFSR'
I. E. Kuznetsov has written: 'Okhrana truda v tekstil'noi promyshlennosti'
B. I. Vykhristenko has written: 'Trudovye prava molodezhi i ikh okhrana'
Vilork L'vovich Sidorov has written: 'Tekhnicheskii progress i okhrana truda'
N. V. Razumikhin has written: 'Prirodnye resursy i ikh okhrana'
Lidiya Vasil'evna Speranskaya has written: 'Mezhdunarodno-pravovaya okhrana morskoi sredy'
Il'ya Mitrofanovich Kutyrin has written: 'Okhrana vodnykh resursov-problema sovremennosti'
A. P. Semenov has written: 'Okhrana truda v SSSR' -- subject(s): Industrial hygiene
Yu. G. Sorokin has written: 'Okhrana truda v neftepererabatyvayushchei i neftekhimicheskoi promyshlennosti'
N. A. Gladkov has written: 'Okhrana prirody' 'Opredelitel' ptits S.S.S.R. =' -- subject(s): Birds
Sharif Tursunovich Atabaev has written: 'Nauchno-tekhnicheskii progress i okhrana okruzhayushchei sredy'