A couple of weeks ago I spent a few days in Riksarkivet. One of the items I looked at was a big volume called Relation om Sachsarnas infall i Lifland (Account of the Saxon invasion of Livonia). It was written by Governor General Dahlbergh's secretary Gustaf Magnus Blåman, but should undoubtedly for all practical purposes be considered as Dahlbergh's work. The actual account is about 230 pages long and stops in early May when the first units of the relief army arrived outside Riga. The volume does however contain a lot more - several hundred pages of attachments (letters, specifications of the strength of the garrison, lists of available supplies etc. - a lot of it originals). Notable are for example letters from Paykull and Flemming, copies of Dahlbergh's letters to them, letters to the Governor General from the Swedish embassy to Russia and from Nils Lillieroot in the Hague - items which of course as a result are missing in the archive of the Livonian Governor General.
One example of what the volume contains is the following list of artillery personnel and guns in the citadel as of 11 March 1700:
Bastion Horn: Two 18-pounders, thirteen 12-pounders and four 3-pounders (also four mortars).
Bastion Christina: Six 12-pounders and six 3-pounders (also one mortar).
Bastion Carolus Gustafvus: Four 24-pounders, two 18-pounders, nine 12-pounders, four 3-pounders (also two mortars).
Bastion Carolus Undecimus: Eleven 18-pounders, two 12-pounders and eight 3-pounders (also two howitzers and three mortars).
Bastion Gustafvus Primus: Four 24-pounders, twelve 18-pounders, four 12-pounders and two 3-pounders (also four mortars).
Bastion Carolus Nonus: Four 24-pounders, six 18-pounders and four 12-pounders (also four mortars).
Bastion Gustafvus Adolphus: Two 24-pounders and four 12-pounders (also two mortars).
Prins Gustafvus: Two 12-pounders and six 3-pounders.
Prins Carl: Six 12-pounders and one mortar.
Princesse: Six 12-pounders and four 3-pounders.
Prins Ullrick: Two 6-pounders, four 3-pounders and one howitzer.
Source: Riksarkivet, M 1374 (list on pages 1008-1009)