If you're tuning with the aid of an electronic tuner, the exact pitch is very often just flat of 1/4 tone down.   So you would tune your guitar 1/2 step down (to Eb Ab Db Gb Bb Eb) on the tuner and then sharpen each string slightly.   On the Korg CA-20 chromatic tuner, you sharpen each string by about +40 Hertz on the scale, almost to the point where the tuner begins to read the Eb string as a flat E, the Ab string as a flat A, and so on.   Again, the right amount can be found by listening to the recordings.

There are some exceptions, though.   For instance, to match the recording for "At the Zoo" at Miami University, you want to tune your guitar to standard pitch (EADGBE) and then capo up 3 frets, just as written on the tab (or, of course, you can tune to a full 1/2 step down and capo up 4 frets).   The same is true for:

For the version of "Fakin' It" on this website from Amsterdam 1970, to match the recording you'll need to tune down just flat of standard pitch (standard pitch -30 Hertz on the Korg CA-20 scale), and then capo the 4th fret instead of the 3rd fret as noted on the tab.   For the versions of "Bridge Over Troubled Water" and "Slip Sliding Away" from the 12 City Solo Acoustic Tour, tune down a full 1/2 step to Eb Ab Db Gb Bb Eb and play with no capo.

To avoid confusion, the capo positions noted in the tabs on this website are for guitars tuned to standard pitch.   To match the recordings accurately, though, for many of the songs (except as noted above), you're going to need to tune all strings down by the 1/4 step mentioned above and capo up one fret higher than is noted on each tab.