ghc

Ontario residents may want to try accessing this provincial database COSINE COSINE (COntrol Survey INformation Exchange) Until recently, they charged a fee for access, but now it's free. You still have to register, and they may object to non-industry people applying. I applied for my workplace and had to confirm via a short telephone interview to get access. Vertical and horizontal control from several agencies, in one (semi) easy to use website.

MNR in Ontario has recently made their COSINE (Control Survey INformation Exchange) retrieval system free. You have to register however, and I'm not sure anyone outside of a related industry would qualify. http://www.cosine.mnr.gov.on.ca/cosine The website hasn't been updated yet, the application form still says it cost$$, but it is free, I just signed my workplace up for an account.