Might also want:
Phillip A Fisher's 'Common Stocks and Uncommon Profit'
Peter Lynch's: One up on Wall Street; Beating the Street.
You can get these, free, from most torrent sites, like... Kickass.to
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From memory, Fisher's advise regarding speculative stocks... i think he called it specialised situation, is this: That while you could make incredible amount of profit on them, they are too dangerous for an average investor. That unless you have specialised knowledge about the specific company and its specific industry, it is best to avoid it.
I don't think you could know the health of these small, specialised, companies from its financial reports. So unless you're willng and able to go and talk to the company, its management, and know what you see and what they tells you... you might not want to speculate, and probably best not to speculate it based on its share prices.
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I remember Buffett saying there are two most important chapters from TII - they dealt with Mr. Market analogy, market behaviour and another i think was about valuing the business, not the stock.
I personally preferred Fisher's, but Graham does provide that framework in more concrete terms.
Once you read these 3 guys, you'll find most others are either wrong or just derivatives and your time are better spent reading annual reports to look for opportunities than reading more books.