The Purusit of God, by AW Tozer, has recently went into the public domain. I highly recommend this book.
If you would like to download a PDF version, click here.
The book is also available in Kindle format (google for that), or thru Librivox in a free audio book. Check out the audiobook here.
I hope this is a blessing to you, as it has been to me, in both formats.
– Scott McClelland