A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z
letters in and out is defined as personal signed letters, not a form letter. This statistic does not include mailing pieces, leaflets or circulars. (HCO PL 5 Feb 71 III)
