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.
To quickly reduce the size of an existing PDF File on a Mac with OS X 1  : Double-click on the PDF file (or right-click on it and select Open With) to open in Finder's Preview. 2  In the Preview menu click Export. 3  Click the button beside  Quartz Filter  and select  Reduce File Size .