This list is from page 4 of the book, with a suggested performance tempo added for each song. That would be the tempo at which you might eventually play it in a group, after you've learned it well.  Count so that the metronome click is on beats 1 and 3 of each measure. See the more detailed explanation below.

Set your metronome to the number of beats per minute shown, and count 2 beats per measure.  The actual meter of the songs is 2/4 (2 beats per measure and a quarter note gets one beat).  However, they are written as if in 4/4 time (4 beats per measure; quarter note gets one beat) because it's easier to read and most other bluegrass tablatures follow this convention.  But it can be confusing when using a metronome to set a tempo. If you were to count 4 beats to the measure and equate each beat with a click of the metronome, these songs would sound twice as fast as they should be.  So set the metronome to the specified tempo and then count the clicks as beat 1 and 3 of the 4 beat measure.  For songs in 3/4 time, there will be a click for each quarter-note in the measure.