Water purifications for the practical man; a handbook of laboratory practice in the water works plant, prepared particularly for the man who has not had the advantages of extended training in chemistry and bacteriology.

"The material incorporated in this book originally appeared as a series of articles in Water works engineering."--Pref.

Basic training in light assembly practice, radio. Prepared at Curriculum construction laboratory, Rochester, New York.

"Prepared in cooperation with the United States Office of Education"-p. [2] of cover.

Modern medicine : its theory and practice, in original contributions by American and foreign authors /

Vols. 4-7, have imprint: Philadelphia and New York, Lea & Febiger.

A briefe and short instruction of the art of musick, to teach how to make discant, of all proportions that are in use : very necessary for all such as are desirous to attaine to knowledge in the art : and may be by practice, if they can sing, soone to be able to compose three, foure, and five parts : and also to compose all sorts of canons that are usuall, by these directions of two or three parts in one, upon the plain-song /

Principally musical examples.

The railway foreman and his job, especially prepared for the education and training of railway foremen by the staff of the American Technical Society in cooperation with a group of railway executives.

Mode of access: Internet.

Professional Services in the EU Internal Market: Quality Regulation and Self-Regulation, by T. Heremans (Oxford: Oxford University Press, 2012, ISBN 9781849462402); xxii+366pp., £75.00 hb.

Book review

Verification and Application of Conceptual Model and Security Requirements on Practical DRM Systems in E-Learning

The paper represents a verification of a previously developed conceptual model of security related processes in DRM implementation. The applicability of established security requirements in practice is checked as well by comparing these requirements to four real DRM implementations (Microsoft Media DRM, Apple's iTunes, SunnComm Technologies’s MediaMax DRM and First4Internet’s XCP DRM). The exploited weaknesses of these systems resulting from the violation of specific security requirements are explained and the possibilities to avoid the attacks by implementing the requirements in designing step are discussed.