Simplify the following text for a Grade 9 native English-speaking person.
Original: By 1955 , the publication of the ISCC-NBS Dictionary of Color Names ( a color dictionary used by stamp collectors to identify the colors of stamps ) , now on the Internet , listed dozens of different shades of lavender .
Simplified: By 1955 , the ISCC-NBS Dictionary of Color Names listed dozens of different shades of lavender .