Why do voter lists vary in content and format?
Because each uezd (district) of each gubernia was responsible for compiling and publishing its own list, and interestingly, this contract was sometimes given to a Jewish printing company. Each district provided the same core information, but some districts provided more or distinct info. A common difference is how the voter list was sorted. Usually it is sorted alphabetically by first letter of last name, but sometimes by voter eligibility reason, etc. Another important reason for variability is that voter eligibility qualifications changed between the 2nd and 3rd Duma.