Declaration of the National Anti-Slavery Convention was written by William Lloyd Garrison for the formation of the American Anti-Slavery Society in December 1833. It was reprinted in The Liberator on December 14, 1833. It is now available in the Public Domain.
You can also use the Optimized PDF option to crank the size down in very targeted ways. Given the big before/after shift, the culprit is probably the image you're embedding. Try exporting that file in various formats (PDF, jpg, png) and then import it.
1 Click Combine Files, and then click Add Files to select the files you want to include in your PDF. 2  Click, drag, and drop to reorder the files and pages. 3  Double-click on a file to expand and rearrange individual pages. 4  Press the Delete key to remove unwanted content.