[Ger-Poland-Volhynia] Tsarist Draft

[DLPratt123 at aol.com]

Can anyone tell me when Volhynian young men would have been subject to  
being drafted into the tsarist army?  I have in mind the period around  1900.  
(It seems several of my relatives emigrated at age 19 or 20, even if  it 
meant the family came later.)
 
Can anyone recommend a book that would answer similar questions of  
interest, including those I can't think to ask?
 
Dan Pratt