True 1623-38 Algenhöhle 1623 1d 1/T + 38 1623-38 Höhlenforschervereinigung Altaussee, 1938 Behind the entrance there is a single passage at right angles to it, with boulders (Blockwerk). Sketch by J. Gaisberger snr., 1938 33m 1623/38.htm 1623/38.htm