72 Pa. Stat. § 5936
The county treasurer of every county, except those of the first and second class, shall adjourn or readjourn until the first day of April, one thousand nine hundred thirty-nine, all tax sales of seated and unseated lands that were to have been held in the years one thousand nine hundred thirty-seven or one thousand nine hundred thirty-eight for nonpayment of taxes. Where any such tax sale is so adjourned or readjourned after advertisement, no additional advertisement or notice shall be necessary for such adjourned or readjourned sale. No such adjournment or readjournment shall invalidate the lien of any tax due and unpaid, or any penalty or interest due thereon; but the lien of all such taxes shall be fully preserved until the date fixed for such sale, in accordance with this act.
72 P.S. § 5936