Hi, I am not sure there is any solution manual available. At least in the old version (I have only that edition available currently) there is only an appendix "Answers to selected problems" at the end of the book.
The author probably made a strong selection while considering the level of difficulty to encourage deep studies. In his foreword (concerning another aspect) he states "...that it is better for a student to grasp the physical reality than [....] to glibly reproduce..." which may be an indicator of his teaching philosophy not to deliver an easy road towards knowledge.
However, you may be a teacher that does not have the time to go through all the suggested problems and seek a shortcut?
Perhaps others will know whether there is such a manual?