Probably the earliest full text of "Shenandoah," from The Riverside Magazine for Young People (Apr., 1868), p. 185:

"Man the capstan bars! Old Dave is our 'chanty-man.' Tune up, David!
                               
O, Shannydore**, I long to hear you!                
Chorus.-- Away, you rollin' river!                                                               O, Shannydore, I long to hear you!
Full Chorus.--Ah ha! I'm bound awAY
On the wild Atlantic!
                                                   
Oh, a Yankee ship came down the river:…
And who do you think was skipper of her?…

Oh, Jim-along-Joe was skipper of her:…
Oh, Jim-along-Joe was skipper of her!…

An' what do you think she had for cargo?…
She had rum and sugar, an' monkeys' liver!…

Then seven year I courted Sally:
An' seven more I could not get her….

Because I was a tarry sailor,--
For I loved rum, an' chewed terbaccy:…

Especially good because it shows the "early" existence of some now familiar verses, the combination of "Shenandoah" with "Sally Brown," and the previously unreported combination with "Blow, Boys, Blow"!

The anonymous author says he (or she) learned this and a couple of other shanties on a recent Atlantic voyage. Will post the others. The author also asserts that "chanty" comes from French "Chantez!"