Material can be found in many locations - you might want to check these links to tools you could use for broader research:
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Below is a sampling of digitized materials available in the Connecticut State Archives regarding the effort to ratify the 19th Amendment to the U.S. Constitution giving women the right to vote. Please note that due to the high interest in woman suffrage materials, the State Archives is making every effort to digitize relevant materials in collections and make them available on-line. Non-digitized archival collections must be used on-site following the requirements for secured collections. The complete finding aids for the parent collections of the items listed below are available at:
These are a few examples.
Letter from Katharine Houghton to the Connecticut State Archives asking if within the collection of the Connecticut Woman Suffrage Association there was a photograph of Katherine Houghton Hepburn at a rally about 1909-1910, of which Ms Houghton had only a poor copy. The response from the State Archives was not scanned.