Bob Friedhoffer

Everything you need for Simple Science Fair Projects

Year unknown

Everything you need for Winning Science Fair Projects

Year unknown

Forces, Motion, and Energy

Forces, Motion, and Energy

Year unknown Richard Kaufman, Linda Eisenberg, Timothy White, and Bob Friedhoffer

Light

Light

Year unknown

Lulu Hurst

Lulu Hurst

Year unknown Lulu Hurst and Bob Friedhoffer

Magic and Perception

Magic and Perception

Year unknown Linda Eisenberg and Bob Friedhoffer

Magic Show

Magic Show

Year unknown Bob Friedhoffer and Linda Eisenberg

Matter and Energy

Matter and Energy

Year unknown Richard Kaufman, Linda Eisenberg, Timothy White, and Bob Friedhoffer

Matter and Perception

Matter and Perception

Year unknown

Molecules and Heat

Molecules and Heat

Year unknown Richard Kaufman, Linda Eisenberg, Timothy White, and Bob Friedhoffer

More Magic Tricks, Science Facts

More Magic Tricks, Science Facts

Year unknown Richard Kaufman, Timothy White, and Bob Friedhoffer

Physics Lab in a Hardware Store

Physics Lab in a Hardware Store

Year unknown Joe Hosking and Bob Friedhoffer

Physics Lab in a Hardware Store (Physical Science Labs)

Year unknown

Physics Lab in a Housewares Store

Physics Lab in a Housewares Store

Year unknown Joe Hosking and Bob Friedhoffer

Physics Lab in a Housewares Store...

Physics Lab in a Housewares Store (Physical Science Labs)

Year unknown

Physics Lab in Hardware Store, Ho...

Physics Lab in Hardware Store, Housewares Store, Home and the Supermarket

Year unknown Joe Hosking and Bob Friedhoffer

Physics Lab in the Hardware Store...

Physics Lab in the Hardware Store, Housewares Store, Home, and the Supermarket

Year unknown

Physics Lab in the Hardware Store...

Physics Lab in the Hardware Store, Houseware Store, Home, and Supermarket

Year unknown

Physics Lab in the Home

Physics Lab in the Home

Year unknown Bob Friedhoffer and Joe Hosking

Physics Lab in the Home

Physics Lab in the Home

Year unknown

Physics Lab in the Home (Physical Science Labs)

Year unknown

Science Lab in a Supermarket

Year unknown

Science Lab in a Supermarket

Science Lab in a Supermarket

Year unknown Bob Friedhoffer and Bob Hosking

Scientific American Science Fair ...

Scientific American Science Fair Projects 4-Volume Set (Scientific American Winning Science Fair Projects)

Year unknown Bob Friedhoffer and Salvatore Tocci

Scientific American, Simple Science Fair Projects, Grades 3-5

Year unknown

Scientific American, Winning Science Fair Projects, Grades 5-7

Year unknown

Scientific Magic Series

Scientific Magic Series

Year unknown Richard Kaufman, Linda Eisenberg, Timothy White, and Bob Friedhoffer

Sound

Sound

Year unknown Richard Kaufman, Linda Eisenberg, Timothy White, and Bob Friedhoffer

Toying Around with Science

Toying Around with Science

Year unknown Linda Eisenberg and Bob Friedhoffer