SPECTRAL LINES
five gases on one wavelength scale, from the violet edge to the red
US$1.50
WHAT A TORNADO BREAKS
twenty-eight damage indicators — and the wind at which each one gives way
US$1.50
THE LARGEST COUNTRIES
the ten largest by surface area — as squares at true scale, each inside the next
US$1.50
PAPER SIZES
the A series · from A0 to A6
US$1.50
CAMERA SENSORS
seven sizes at one scale, with the crop factor computed from the diagonal
US$1.50
PETROL AND DIESEL
nine lines of comparison, and in three of them the requirement is the same for both
US$1.50