What has the author Alan Gray Slemon written?

Leon Gray has written:

'Zinc' -- subject(s): Juvenile literature, Zinc alloys, Zinc

'Backyard (Close-Up)'

'Twins Too'

'Puberty' -- subject(s): Juvenile literature, Puberty

'Transportation' -- subject(s): Transportation, Juvenile literature

'Close-Up, Insects (Close-Up)'

'Zinc (Elements)'