Shell Research 1948 Ad $9.00 Shell Research November 20, 1948 ad states Pure Alcohol from Petroleum $9.00 Shell Research November 20, 1948 ad states Pure Alcohol from Petroleum $9.00 Shell Research 1949 Ad $9.00 Shell Research 1949 Ad $9.00 Shell Research 1949 Ad $9.00 Shell Research 1949 Ad $9.00 Shell Research 1949 Ad. $9.00 Shell Research 1949 Ad $9.00 Shell Research 1950 Ad $9.00 Shell X 100 Motor Oil 1951 Ad $11.00 Shell X 100 Motor Oil 1952 Ad $11.00 Shell X 100 Motor Oil 1951 Ad $11.00 Shell X 100 Motor Oil 1951 Ad $11.00 Shell X 100 Motor Oil 1951 Ad $11.00 Shell X 100 Motor Oil 1951 Ad $11.00 Shell X 100 Motor Oil 1951 Ad $11.00 Shell X 100 Motor Oil 1951 Ad. $11.00 Shell X 100 Motor Oil 1951 Ad $11.00 Shell X 100 Motor Oil 1951 Ad. $11.00