A Marriage
Record can be found in a number of places: The town clerk (New England States primarily), the local
county courthouse (and not always in the county they lived), minister's records, church records and via the state.
These are also considered primary sources. Which means the information is usually pretty reliable because it was recorded
at the time of the event.
Substitutions
are: bible records, town clerk collections (New England States again), etc. These tend to lean more towards
secondary evidence depending on the source and time lapsed between the event and when it was recorded.