Stan Musial baseball cards continue to be very popular among collectors.

Widely considered the greatest baseball player ever to wear a St. Louis Cardinals uniform, Stan “The Man” Musial was also one of the greatest and most feared hitters of all time.

Although his career spanned 22 seasons, he has relatively fewer baseball cards to collect than say, Willie Mays, who also played 22 seasons. Musial was under contract with Bowman through 1953 so you won’t find him on either of the legendary 1952 or 1953 Topps sets.

And from 1954 to 1957, Musial did not appear on Bowman or Topps baseball cards at all stating that he “just didn’t want to sign (a contract) for cards.” according to Topps executive Sy Berger in a 2001 USA Today interview.

Nonetheless, Stan Musial baseball cards remain some of the most collectible in the hobby.

Willie Mays baseball cards are some of the most collected in the hobby.

The Say Hey Kid easily ranks on anyone's list as one of Major League Baseball's all time greatest--if not the greatest.

Harry Jupiter of the San Francisco Chronicle once said:

"No record book reflects this kind of concentration, determination, perseverance or ability. As a player, Willie Mays could never be captured by mere statistics."

He is one of the most beloved baseball players in the history of the sport making Willie Mays baseball cards some of the most collectible in the hobby.

Listed here are 27 of Mays' most important baseball cards that you can filter by the various methods shown below.

Sandy Koufax baseball cards are some of the most sought after of any pitcher in baseball.

Once known as "The Left Arm of God", Koufax was arguably the greatest lefty the game has ever seen.

His career started slowly as he struggled with his command for much of his first six seasons. Then, in 1961, he got things under control and put together a string of six of the most dominant years a pitcher has ever produced.

During that stretch he compiled a jaw-dropping three pitching triple crowns, four no-hitters and one perfect game. For his achievements, Koufax became the youngest player ever inducted into the Baseball Hall of Fame at just 36 years old.

Listed here are 13 of Koufax's most important baseball cards in the collecting hobby.