Notes:
The US didn't have national paper currency until 1861¹, so banks & companies would sometimes issue their own currency. The C&O Canal company issued paper currency known as "scrip" to pay it's workers during times when it was low on funds. This page contains scrip that was issued by the C&O Canal Company, as well as scrip that was issued by contractors that helped build the C&O Canal.

	1837 25-cent note This 25 cent note was issued Aug 10, 1837 by the C&O Canal company. It has a neat picture of what appears to be a native american in a canoe. The note says that it can be redeemed for 25 cents when the amount of five dollars is presented. I assume that meant you had to collect at least $5 worth of these notes in order to trade them in for real money (coins).
	1838 $1 note This is a $1 note issued April 16, 1838 by J. Noble Nisbet for section 329 & lock no 68. Nisbet was contracted to work on lock 68 on May 16, 1838, and the contract was abandoned on November 14, 18382.
	1838 50-cent note This is similar to the above note, but it's for 50 cents.
	1838 25-cent note This is similar to the above note, but it's for 25 cents.
	1838 50-cent note This is another 50 cent note issued by J. Noble Nisbet for lock 62, but it was issued on April 18, 1838 (the other was April 16). This one also has a picture of a canal boat on the top.
	1838 25-cent note This is another 25 cent note issued by J. Noble Nisbet for lock 62, but it was issued on April 18, 1838 (the other was April 16).
	1838 25-cent note This 25 cent note was issued May 25, 1838 for section number 323, where the Town Creek aqueduct was built. This section was contracted to Frederick Pratt in 1837, and abandoned on November 14, 18382, however the note does not have Pratt's name on it.
	1840 $20 note (Frederick) This is a $20 note published in 1840, with the city "Frederick" Maryland printed in the top center.
	1840 $20 note (Washington) This is similar to the $20 note above, but it has the city "Washington" printed in the top center.
	1840 $10 note (Frederick) This is a $10 note published in 1840, with the city "Frederick" Maryland printed in the top center.
	1840 $10 note (Washington) This is similar to the $10 note above, but it has the city "Washington" printed in the top center.
	1840 $5 note (Frederick) This is a $5 note published in 1840, with the city "Frederick" Maryland printed in the top center.
	1840 $5 note (Washington) This is similar to the $5 note above, but it has the city "Washington" printed in the top center.