1st selection is also found on the TV themes page, and is
from the early 1960s.
Other selections are a revival of excerpts I put on the University of Delaware PLATO system in the 1980s, based on my memory of the 1959 record LP.
Row Row Row Your Boat This is presented as a simple "round", which is the term used by Captain Kangaroo himself.
One More River to Cross Captain Kangaroo mentioned Noah's ark being built "at the Lord's command". I heard the spoken words "The animals marched in 2 by 2" followed by sung "There's one more river to cross" (and then repeat this?). Then I heard "One more river, and that's the river of Jordan; one more river, there's one more river to cross." But does that resemble the story of Joshua leading the Israelites the rest of the way into the Promised Land?