Patricia,
In order to attemp to reply to your query, one would first need to know the context of the lot.
I.e. In which province is this lot located because the system is not the same in every provinces.
In Quebec and Ontario, a Lot is a subdivision of a Concession, which is a subdivision of a Township.
A Township map will normally have the Concessions and Lots indicated on it.
The Lot number "CA13" which you provided does not fit the normal lot number system which is a number which is sometime followed by a letter to indicate a subdivision of the lot, such as "14b".
For a a more detailed explanation of this land subdivision system,
For the system used for Qyebec and Ontario, please see
Concession road, and
for the western provinces, please see
Dominion Land SurveyCheers,