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Start in your Google Docs version of your pdf you'd like to embed on your page.
Click "File", then choose "Embed this PDF file..." from the menu.
A long link of HTML code shows up - select it all and copy it.
Go to your page you want to embed the pdf file in and click the edit pencil, then click the <HTML> button on the top. Paste what you copied from the pdf page into the window and hit "Update" in the window, then "Save" at the top of the page. Your pdf will show up as a gadget on your page that you can move as you see fit!