I wonder why tunnels are round : and other questions about building /

Parker, Steve, 1952-

I wonder why tunnels are round : and other questions about building / Steve Parker. - London : Kingfisher, 2001. - 32 p. : col. ill. ; 29 cm. - I wonder why .

Includes index.


Earthmoving machinery--Juvenile literature.
Structural engineering--Juvenile literature.
Buildings.
Earthmoving machinery.
Questions and answers.
Structural engineering.

TA634 / .P37 2001