If you're doing anything technical, think Mathematica--not just for computation but for modeling, simulation, visualization, development, documentation, and deployment.

Why Mathematica? Because this one integrated software system delivers unprecedented workflow, coherence, reliability, and innovation. Rather than requiring different toolkits for different jobs, Mathematica has been built from its inception to deliver one vision: the ultimate technical computing environment

Reuploaded. Thanks to nox!

Objective IELTS is a 2-level IELTS preparation course providing comprehensive training for both the Academic and General Training modules. The course is uniquely informed by the Cambridge Learner Corpus, using analysis of real IELTS candidate papers. The 2 levels of Objective IELTS can be used on their own or consecutively, so that lower-level students requiring a high band score can start preparing early.

Teacher's book added Thanks to oralwords

This book covers the management of all major emergencies and professional dilemmas (e.g. issues of consent) facing the gynaecologist, ranging from problems of a medical nature through to those requiring surgical intervention.