Bing found the following results
Proletariat - Wikipedia
Proletariat | Definition, History, & Industrial Revolution
Proletarian Definition & Meaning - Merriam-Webster
Proletariat Definition & Meaning - Merriam-Webster
PROLETARIAN | definition in the Cambridge English Dictionary
Proletariat - New World Encyclopedia
PROLETARIAT | definition in the Cambridge English Dictionary
Proletariat | Encyclopedia.com
PROLETARIAT Definition & Meaning | Dictionary.com
Proletariat (Working Class) - Sociology - Oxford Bibliographies