I have find totally 34/45 "Lambo Lectors" in Half-Life 2 (orange box)

I know you can't describe exactly where my last 11 are, but if you can see down here that I have find less than it exists, just tell me and atleast I know that... But I have most of the "easy find" lectors, so if u know if any of the really "hard to find lectors" (if they exist) are u can describe it.

Or if you know a good "Lambo Lectors walkthrough" - Please give me the link. (It's hard to ask a question when it's a lot of them in the same question) So please in some way, your help should be a lot help to me, because - I really want this achivment. / Thnx in advance

Here is what I have find so far, maybe it's some "help" for u:

Chapter 1 - 3 (Have 8 Totally in these three chapters)

Chapter 4 - (6 in water hazard)

Chapter 5 - (1 in Black Mesa)

Chapter 6 - (2 in Ravenholm)

Chapter 7 - (4 in Highway 17)

Chapter 8 - (0 I havn't find any in sandtraps)

Chapter 9 - (3 in Nova Prospect)

Chapter 10 - (0 I havn't find any in entanglend)

Chapter 11 - (9 in Antiz.. Zone)

Chapter 12 - (1 in 'Follow Freeman')

Chapter 13 - (0 I havn't find any in Dark energy)