2006 87¢ Dr. Albert Sadin Plate Block

United States #1285 8¢ Albert Einstein Plate Block*Plate number and position may vary from image shown.

United States #1774 15¢ Albert Einstein Plate Block

United States #3428 - 63¢ Dr. Jonas Salk Plate Block*Plate number and position may vary from image shown.

United States #1279 1 1/4¢ Albert Gallatin Plate Block*Plate number and position may vary from image shown.

United States #1754 13¢ Dr. Papanicolaou Plate Block

United States #2193 $1 Dr. Bernard Revell Plate Block*Plate number and position may vary from image shown.

United States #2013 20¢ Dr. Mary Walker Plate Block

United States #4000 - 24¢ Common Buckeye Butterfly Plate Block*Plate number and position may vary from image shown.

United States #4117 - 39¢ EID Self-Adhesive Plate Block*Plate number and position may vary from image shown.