算術運算

Addition -- Juvenile literature. Subtraction -- Juvenile literature. Mathematical recreations -- Juvenile literature.

Drug control -- Periodicals European Monitoring Centre for Drugs and Drug Addiction Toxicomania Estupefaciente

Drug abuse -- European Union countries -- Prevention -- Periodicals Drug abuse -- European Union countries -- Periodicals

Drug abuse -- European Union countries -- Periodicals Drug abuse -- European Union countries -- Prevention -- Periodicals

Drug abuse -- Europe, Eastern -- Prevention -- Periodicals Drug abuse -- Europe, Central -- Prevention -- Periodicals Drug abuse -- International cooperation -- Prevention -- Periodicals

Male friendship -- Fiction. Friendship -- Fiction. Secrecy -- Fiction. Older men -- Fiction. Martha's Vineyard (Mass.) -- Fiction.

Counting -- Juvenile fiction.