Is this copyrighted?

Short Answer: No, the book is not copyrighted, at least not in the United States of America.

Long Answer: According to the title page in the book, it was published in 1921. According to project Gutenberg, "Any book published anywhere before 1923 is in the public domain in the U.S." You can check it for yourself under section C.10. of the Gutenberg article "Gutenberg:Copyright FAQ".

Because I personally scanned the book, I could legally claim the images I scanned under copyright. Instead, I am releasing them into the public domain.

You can do anything with this book that you want.

You can distribute it. You can let your friends burn it onto CDs/DVDs or whatever. You can reverse-engineer it and decompile it. You can print seven million copies of it and try to sell it for $100 a page (I give no guarantee that this will work, but people are gullible sometimes). You can post it on your website or send it to friends in those obnoxious chain emails. You can create your own Learn Hebrew Program from it. You can turn it into a nice antiqueish wallpaper design and sell it across the country. I have placed no restrictions (or warranties) whatsoever upon your use of this material.

And in case you were wondering, you can also use it for Paper Mache.