Secondary School ‘KS3 (Key Stage 3) - Maths – Angles, Bearings and Scale Drawings – Ages 11-14’ eBook    by Dr John Kelliher
Price: $2.99 USD. 870 words. Published on June 5, 2012. .
This eBook introduces the subjects of angles, bearings and scale drawings. To angles as it relates to angular turn about a point, angles in polygons, angle facts and inter-relational aspects with parallel as well as crossing lines, to bearings as they relate to navigation and scale drawings as an aspect of technical drawing.

Vivitar Solid Glass Mirror Lenses    by David Barth
Price: $0.99 USD. 2540 words. Published on January 21, 2013. .
This is an essay about telephoto mirror lenses that use solid glass instead of thin glass reflectors.

Fotografía Digital Réflex Paso a Paso    by Estudio FotoArte
Price: $5.87 USD. 20730 words. Published by icono on February 11, 2013. .
Este libro está destinado a aquellos que desean adentrarse en el mundo de la fotografía como pasatiempo, como una meta laboral o simplemente para capturar mejores tomas. Sea cual fuera tu situación, lo primero y más importante para iniciarte en fotografía es establecer los fundamentos esenciales de manera correcta.