Larsen played Catalan systems for quite some time. If you didn't qualify for a FREE copy from Nov.-Dec. purchases of $100 or more, than the price of the book is $12.95 + $3.50 for S&H. It is #7 in the Chess Gangs of New York and London series.
The other Larsen piece, called GM BENT LARSEN ON OPENINGS by Allan Savage should be ready to ship tomorrow as a PDF. Some additional material in the form of quotes and further Larsen books by and about him have also been added. The Bonus material will come later in the year, for FREE. This 16 page monograph on Larsen is from FM Allan Savage who also engaged in some correspondence with Larsen as well as played against him. The price is $9.95 unless you have a Black Gold Card ($50) and then the price is only $5.00. There are advantages to having the Gold Card (now called Black Gold Card) as several more Special SCORE Reports will be issued in 2012. Deadline to purchase the BGC is March 31, 2012.