Designed for a one-semester advanced calculus course, Advanced Calculus explores the theory of calculus and highlights the connections between calculus and real analysis -- providing a mathematically sophisticated introduction to functional analytical concepts. The text is interesting to read and includes many illustrative worked-out examples and instructive exercises, and precise historical notes to aid in further exploration of calculus.
The Sky is Your Laboratory: Advanced Astronomy Projects for Amateurs
For the experienced amateur astronomer who is wondering if there is something useful, valuable, and permanent that can be done with his or her observational skills, the answer is, "Yes, you can!" This is the book for the experienced amateur astronomer who is ready to take a new step in his or her astronomical journey. Unfortunately, there is no modern text that points curious amateur astronomers to the research possibilities that are open to them.
Listening In and Speaking Out focuses on spontaneous spoken English with the aim of bridging the gap between "classroom English" an the English that students are likey to encounter on their own. The activities are based on two kinds of recordings made by native speakers of English from various regions of the United States.
Success is a six-level course for Upper Secondary school students aged 14-20 years, taking learners from zero beginner to an advanced level of English competency.
Here's a testbook for pre-intermediate level with photocopible materials of tests with answers.
