Sweet recovery! The good news is that you found what could represent a chunk of change. The bad news is that you'll have to do some more work to get it. Just be careful to not create further damage, by soaking them. The Govt. stopped printing these gold certificates in 1933, and declared that owning them was illegal. Fortunately, in 1964, they removed the restriction from owning them. Now the only "restriction" is that they only pay face value for those they can properly identify. But from the looks of your pictures, you should have several hundred dollars there, should you decide to "sell" them to the Govt. Maybe more to a collector.
Link to options available for Gold certificates. http://www.treasury.gov/resource-center/faqs/Currency/Pages/edu_faq_currency_sales.aspx
Link to US Bureau of Engraving's as to what they do for "mutilated" (buried) currency. http://www.bep.treas.gov/uscurrency/damagedcurrency.html
What is Mutilated Currency? Notes which are NOT CLEARLY more than one-half of the original note and/or, in such condition that the value is questionable and special examination is required to determine its value. Currency can become mutilated in any number of ways. The most common causes are: fire, water, chemicals, explosives; animal, insect or rodent damage; and petrification or deterioration by burying. Under regulations issued by the Department of the Treasury, mutilated United States currency may be exchanged at face value if: More than 50% of a note identifiable as United States currency is present; or, 50% or less of a note identifiable as United States currency is present, and the method of mutilation and supporting evidence demonstrates to the satisfaction of the Treasury that the missing portions have been totally destroyed.
HH Randy