Print (paper) publications may be found via Omni (The York Library Catalogue). Instructions may be found on the Omni Search Guide
The Canadian Research Index contains records of Provincial Government Publications from 1980 to 2017. Narrow down your search by putting the name of the province in a separate field and in the advance search screen and selecting 'Company/Organization':
York owns microfiche copies of the items having a Microlog Number in the Microtext Room (Room 118 of the Scott Library): 