Knutsen, Saeter

Hello, I am hoping to find a birth record for Constance Nordvesta Knutsen Saeter, born 19 September 1873 in the Parry Sound District to Norwegian parents Martin Knutsen Saeter and Karoline Nicolaisdatter Hessen. I know that Martin was part of the community that founded St. Olaf's Church in Monteith Township, and that they occupied lots 7-8 in concession X and lot 7 in concession IX. From what I can tell, Constance's mother Karoline died in childbirth in 1879, and after that time Martin and the children moved to the US, where they appear on the 1880 US Census in North Dakota. I haven't found any indexed birth records with Constance's name yet on Ancestry or FamilySearch.org, so I have started trying to go through the thousands of record images one by one with no luck so far. I am hoping someone can help me figure out how to narrow down my search to find Parry Sound birth records from 1873. Thank you!